Hmmm. Why do I want to intentionally break a seal? And if so: how much of a seal break is OK? And in general: what is the point in constructing a headphone, which depends on a seal break to work as intended? Possibly a "workaround" for a flawed design?
That's indeed the question. If it needs a breach of seal, then why not build it in via venting anyway - or heck even make them a fully open pair of headphones ? Would there be any inherent limitations to planar headphones for such an approach (I'm not aware of it - after all it seems like some of Stax' newer lambdas have deliberate venting, so...) ?
BTW aren't the pads already fenestrated ?